Users' Mathboxes Mathbox for Alan Sare < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  onfrALTlem2 Structured version   Visualization version   GIF version

Theorem onfrALTlem2 38243
Description: Lemma for onfrALT 38246. (Contributed by Alan Sare, 22-Jul-2012.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
onfrALTlem2 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ∃𝑦𝑎 (𝑎𝑦) = ∅))
Distinct variable groups:   𝑦,𝑎   𝑥,𝑦

Proof of Theorem onfrALTlem2
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 simpr 477 . . . . . . . . . . . 12 (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑧 ∈ (𝑎𝑦))
212a1i 12 . . . . . . . . . . 11 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑧 ∈ (𝑎𝑦))))
3 inss2 3812 . . . . . . . . . . . 12 (𝑎𝑦) ⊆ 𝑦
43sseli 3579 . . . . . . . . . . 11 (𝑧 ∈ (𝑎𝑦) → 𝑧𝑦)
52, 4syl8 76 . . . . . . . . . 10 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑧𝑦)))
6 inss1 3811 . . . . . . . . . . . . 13 (𝑎𝑦) ⊆ 𝑎
76sseli 3579 . . . . . . . . . . . 12 (𝑧 ∈ (𝑎𝑦) → 𝑧𝑎)
82, 7syl8 76 . . . . . . . . . . 11 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑧𝑎)))
9 simpl 473 . . . . . . . . . . . . . . 15 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → 𝑎 ⊆ On)
10 simpl 473 . . . . . . . . . . . . . . 15 ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → 𝑥𝑎)
11 ssel 3577 . . . . . . . . . . . . . . 15 (𝑎 ⊆ On → (𝑥𝑎𝑥 ∈ On))
129, 10, 11syl2im 40 . . . . . . . . . . . . . 14 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → 𝑥 ∈ On))
13 eloni 5692 . . . . . . . . . . . . . 14 (𝑥 ∈ On → Ord 𝑥)
1412, 13syl6 35 . . . . . . . . . . . . 13 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → Ord 𝑥))
15 ordtr 5696 . . . . . . . . . . . . 13 (Ord 𝑥 → Tr 𝑥)
1614, 15syl6 35 . . . . . . . . . . . 12 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → Tr 𝑥))
17 simpll 789 . . . . . . . . . . . . . 14 (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑦 ∈ (𝑎𝑥))
18172a1i 12 . . . . . . . . . . . . 13 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑦 ∈ (𝑎𝑥))))
19 inss2 3812 . . . . . . . . . . . . . 14 (𝑎𝑥) ⊆ 𝑥
2019sseli 3579 . . . . . . . . . . . . 13 (𝑦 ∈ (𝑎𝑥) → 𝑦𝑥)
2118, 20syl8 76 . . . . . . . . . . . 12 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑦𝑥)))
22 trel 4719 . . . . . . . . . . . . 13 (Tr 𝑥 → ((𝑧𝑦𝑦𝑥) → 𝑧𝑥))
2322expcomd 454 . . . . . . . . . . . 12 (Tr 𝑥 → (𝑦𝑥 → (𝑧𝑦𝑧𝑥)))
2416, 21, 5, 23ee233 38207 . . . . . . . . . . 11 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑧𝑥)))
25 elin 3774 . . . . . . . . . . . 12 (𝑧 ∈ (𝑎𝑥) ↔ (𝑧𝑎𝑧𝑥))
2625simplbi2 654 . . . . . . . . . . 11 (𝑧𝑎 → (𝑧𝑥𝑧 ∈ (𝑎𝑥)))
278, 24, 26ee33 38209 . . . . . . . . . 10 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑧 ∈ (𝑎𝑥))))
28 elin 3774 . . . . . . . . . . 11 (𝑧 ∈ ((𝑎𝑥) ∩ 𝑦) ↔ (𝑧 ∈ (𝑎𝑥) ∧ 𝑧𝑦))
2928simplbi2com 656 . . . . . . . . . 10 (𝑧𝑦 → (𝑧 ∈ (𝑎𝑥) → 𝑧 ∈ ((𝑎𝑥) ∩ 𝑦)))
305, 27, 29ee33 38209 . . . . . . . . 9 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → (((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) ∧ 𝑧 ∈ (𝑎𝑦)) → 𝑧 ∈ ((𝑎𝑥) ∩ 𝑦))))
3130exp4a 632 . . . . . . . 8 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → (𝑧 ∈ (𝑎𝑦) → 𝑧 ∈ ((𝑎𝑥) ∩ 𝑦)))))
3231ggen31 38242 . . . . . . 7 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → ∀𝑧(𝑧 ∈ (𝑎𝑦) → 𝑧 ∈ ((𝑎𝑥) ∩ 𝑦)))))
33 dfss2 3572 . . . . . . . 8 ((𝑎𝑦) ⊆ ((𝑎𝑥) ∩ 𝑦) ↔ ∀𝑧(𝑧 ∈ (𝑎𝑦) → 𝑧 ∈ ((𝑎𝑥) ∩ 𝑦)))
3433biimpri 218 . . . . . . 7 (∀𝑧(𝑧 ∈ (𝑎𝑦) → 𝑧 ∈ ((𝑎𝑥) ∩ 𝑦)) → (𝑎𝑦) ⊆ ((𝑎𝑥) ∩ 𝑦))
3532, 34syl8 76 . . . . . 6 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → (𝑎𝑦) ⊆ ((𝑎𝑥) ∩ 𝑦))))
36 simpr 477 . . . . . . 7 ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → ((𝑎𝑥) ∩ 𝑦) = ∅)
37362a1i 12 . . . . . 6 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → ((𝑎𝑥) ∩ 𝑦) = ∅)))
38 sseq0 3947 . . . . . . 7 (((𝑎𝑦) ⊆ ((𝑎𝑥) ∩ 𝑦) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → (𝑎𝑦) = ∅)
3938ex 450 . . . . . 6 ((𝑎𝑦) ⊆ ((𝑎𝑥) ∩ 𝑦) → (((𝑎𝑥) ∩ 𝑦) = ∅ → (𝑎𝑦) = ∅))
4035, 37, 39ee33 38209 . . . . 5 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → (𝑎𝑦) = ∅)))
41 simpl 473 . . . . . . 7 ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → 𝑦 ∈ (𝑎𝑥))
42412a1i 12 . . . . . 6 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → 𝑦 ∈ (𝑎𝑥))))
43 inss1 3811 . . . . . . 7 (𝑎𝑥) ⊆ 𝑎
4443sseli 3579 . . . . . 6 (𝑦 ∈ (𝑎𝑥) → 𝑦𝑎)
4542, 44syl8 76 . . . . 5 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → 𝑦𝑎)))
46 pm3.21 464 . . . . 5 ((𝑎𝑦) = ∅ → (𝑦𝑎 → (𝑦𝑎 ∧ (𝑎𝑦) = ∅)))
4740, 45, 46ee33 38209 . . . 4 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → (𝑦𝑎 ∧ (𝑎𝑦) = ∅))))
4847alrimdv 1854 . . 3 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ∀𝑦((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → (𝑦𝑎 ∧ (𝑎𝑦) = ∅))))
49 onfrALTlem3 38241 . . . 4 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ∃𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅))
50 df-rex 2913 . . . 4 (∃𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅ ↔ ∃𝑦(𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅))
5149, 50syl6ib 241 . . 3 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ∃𝑦(𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅)))
52 exim 1758 . . 3 (∀𝑦((𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → (𝑦𝑎 ∧ (𝑎𝑦) = ∅)) → (∃𝑦(𝑦 ∈ (𝑎𝑥) ∧ ((𝑎𝑥) ∩ 𝑦) = ∅) → ∃𝑦(𝑦𝑎 ∧ (𝑎𝑦) = ∅)))
5348, 51, 52syl6c 70 . 2 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ∃𝑦(𝑦𝑎 ∧ (𝑎𝑦) = ∅)))
54 df-rex 2913 . 2 (∃𝑦𝑎 (𝑎𝑦) = ∅ ↔ ∃𝑦(𝑦𝑎 ∧ (𝑎𝑦) = ∅))
5553, 54syl6ibr 242 1 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ∃𝑦𝑎 (𝑎𝑦) = ∅))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 384  wal 1478   = wceq 1480  wex 1701  wcel 1987  wne 2790  wrex 2908  cin 3554  wss 3555  c0 3891  Tr wtr 4712  Ord word 5681  Oncon0 5682
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pr 4867
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-fal 1486  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-nul 3892  df-if 4059  df-sn 4149  df-pr 4151  df-op 4155  df-uni 4403  df-br 4614  df-opab 4674  df-tr 4713  df-eprel 4985  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-ord 5685  df-on 5686
This theorem is referenced by:  onfrALT  38246
  Copyright terms: Public domain W3C validator